Safety evaluation of initial support based on refined model

doi:10.16265/j.cnki.issn1003-3033.2019.S1.030

Abstract

Abstract: To evaluate the safety of the initial support structure of the tunnel more accurately, in consideration of the geometrical dimensions, material composition and mechanical parameters, a precise evaluation method is proposed. Firstly, the tunnel excavation profile was obtained by laser-point cloud technology, and then the precise geometric model of the initial support was established according to it. Then, considering the characteristics that the super-excavation part was filled with plain concrete, the initial support was divided into standard area consist of steel arch concrete and over-excavation area consist of plain concrete. ANSYS was used to establish a precise calculation model, and the allowable deformation amount and safety factor were calculated and analyzed. Combining with a certain railway tunnel, and considering the over-excavation and the use of the precise model to analyze, the results show that the allowable deformation of the actual initial support structure is greatly reduced compared with that without considering over-excavation. Some of the safety factors of different parts are increased and some are decreased. It is more scientific to carry out the safety control section-by-section in engineering practice.

Key words: tunnel engineering, over-under-excavation, initial support, profiled structure, numerical analysis, safety evaluation

CLC Number:

X913.4

WU Yimin, CAI Zhiyan, FU Helin, XU Wenhao, DAI Lusheng, MA Zhe. Safety evaluation of initial support based on refined model[J]. China Safety Science Journal, 2019, 29(S1): 168-172.

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